日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 4 (2003),
pp. 181-184

Fabrication of FeSi Thermoelectric Element Utilizing the MA/SPS Process and its Thermoelectric Properties

Jun-ichi Yamamoto1, Yasuo Shimizu2, Hajime Otani2, and Keisuke Shiozaki2,

1Industrial Research Institute of Nagano Prefecture, Nagano 380-0928
2Department of Mechanical System Engineering, Faculty of Engineering, Shinshu University, Nagano 380-8553

Abstract:

P-type and n-type β-FeSi2 was produced by utilizing the process of mechanical alloying (MA) and spark plasma sintering (SPS) technique. Raw powders of pure iron, silicon, manganese and cobalt were mixed and mechanically alloyed for 72 ks using planetary ball mill. The mixing fractions of the powders were in accord with the mole fractions of the Fe0.92Mn0.08Si2(p-type) and Fe0.98Co0.02Si2(n-type), respectively. The SPS temperature for producing p-type β-FeSi2 was 1073--1153 K and n-type β-FeSi2 was 1073--1173 K, and the holding time was 0.3 ks. When the sintering temperature was over these temperature, α-FeSi2 was produced and thermoelectric properties was reduced. The density of p-type β-FeSi2 sintered at 1153 K was 4.64 g/cm3 (the relative density was 94.1%), and the maximum powerfactor was 0.30 mW/mK2 at 850 K\@. The density of n-type β-FeSi2 sintered at 1173 K was 4.71 g/cm3 (the relative density was 95.5%), and the maximum powerfactor was 0.058 mW/mK2 at 650 K.


(Received November 29, 2002)

Keywords:

mechanical alloying, spark plasma sintering, thermoelectric materials, β-FeSi2


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